# from gevent import monkey; monkey.patch_all()
# from gevent.wsgi import WSGIServer
# import gevent
# import tornado
# import tornado.web
# import tornado.wsgi
 
 
# class IndexHandler(tornado.web.RequestHandler):
#     def get(self):
#         self.write('hello world')
 
# def app(env, start_response):
#     start_response('200 OK', [('Content-Type', 'text/html')])
#     return ["<b>hello world</b>"]
 
 
 
# if __name__ == "__main__":
#     application = tornado.wsgi.WSGIApplication(handlers=[(r"/", IndexHandler)])
#     server = gevent.wsgi.WSGIServer(('', 8000), app)
#     server.serve_forever()